@article{AL_2002_41_5_a5,
     author = {V. L. Selivanov},
     title = {Decidability of {Hierarchies} of {Regular} {Aperiodic} {Languages}},
     journal = {Algebra i logika},
     pages = {610--631},
     publisher = {mathdoc},
     volume = {41},
     number = {5},
     year = {2002},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_2002_41_5_a5/}
}